Congress did not impeach Lincoln nor attempt to.
I know you guys want to rewrite history but you can't.
The South could have taken Washington-but didn't
The Congress could have impeached Lincoln-but didn't.
You are imposing a fraudulent constraint. Nobody ever denied the power of Congress to impeach. What was denied, as it should be, is your false and absurd assertion that impeachment is the only means by which Congress may disapprove of a President's actions.